BIO 124 - Exam 1 ACTUAL Exam
Questions and CORRECT Answers
Matter - CORRECT ANSWER - anything that has mass and occupies space
How many elements can be found in the human body? - CORRECT ANSWER - 24
Major elements - CORRECT ANSWER - oxygen, carbon, hydrogen, nitrogen
Atom - CORRECT ANSWER - Basic unit of matter
Molecule - CORRECT ANSWER - two or more atoms held together by covalent bonds
Compound - CORRECT ANSWER - a molecule composed of two or more different
elements
Isotopes - CORRECT ANSWER - Atoms of the same element with different numbers of
neutrons
valence shell - CORRECT ANSWER - outermost electron shell
octet rule - CORRECT ANSWER - atoms react by gaining or losing electrons so as to
acquire the stable electron structure of eight valence electrons
chemical energy is - CORRECT ANSWER - A form of potential energy that is stored in
chemical bonds between atoms.
An atom's nucleus is composed of - CORRECT ANSWER - protons and neutrons
, The element lithium has 3 protons and 4 neutrons in its nucleus. It's mass number is - CORRECT
ANSWER -7
When atoms of two different elements bind together, they form a(n) - CORRECT
ANSWER - compound
What is am example of a homogeneous mixture? - CORRECT ANSWER - A solution
The most important determinant of an atom's bonding behavior is... - CORRECT
ANSWER - the number of valence shell electrons
When atoms gain electrons - CORRECT ANSWER - the atoms become negatively
charged
Ionic bonds connect atoms together by - CORRECT ANSWER - charge attractions
covalent bonds occur when - CORRECT ANSWER - electrons are shared between atoms
An atom will tend to be electronegative if - CORRECT ANSWER - it lacks only 1-2
electrons in the valence shell
Water, H2O, is a polar molecule. Oxygen is electronegative and hydrogen is electropositive. This
means that __________. - CORRECT ANSWER - the oxygen pulls electrons away from
hydrogen and becomes more negative
The process that occurs when chemical bonds are formed, broken, or rearranged, or electrons are
transferred between reactants is called... - CORRECT ANSWER - A chemical reaction
Energy - CORRECT ANSWER - the capacity to do work
Questions and CORRECT Answers
Matter - CORRECT ANSWER - anything that has mass and occupies space
How many elements can be found in the human body? - CORRECT ANSWER - 24
Major elements - CORRECT ANSWER - oxygen, carbon, hydrogen, nitrogen
Atom - CORRECT ANSWER - Basic unit of matter
Molecule - CORRECT ANSWER - two or more atoms held together by covalent bonds
Compound - CORRECT ANSWER - a molecule composed of two or more different
elements
Isotopes - CORRECT ANSWER - Atoms of the same element with different numbers of
neutrons
valence shell - CORRECT ANSWER - outermost electron shell
octet rule - CORRECT ANSWER - atoms react by gaining or losing electrons so as to
acquire the stable electron structure of eight valence electrons
chemical energy is - CORRECT ANSWER - A form of potential energy that is stored in
chemical bonds between atoms.
An atom's nucleus is composed of - CORRECT ANSWER - protons and neutrons
, The element lithium has 3 protons and 4 neutrons in its nucleus. It's mass number is - CORRECT
ANSWER -7
When atoms of two different elements bind together, they form a(n) - CORRECT
ANSWER - compound
What is am example of a homogeneous mixture? - CORRECT ANSWER - A solution
The most important determinant of an atom's bonding behavior is... - CORRECT
ANSWER - the number of valence shell electrons
When atoms gain electrons - CORRECT ANSWER - the atoms become negatively
charged
Ionic bonds connect atoms together by - CORRECT ANSWER - charge attractions
covalent bonds occur when - CORRECT ANSWER - electrons are shared between atoms
An atom will tend to be electronegative if - CORRECT ANSWER - it lacks only 1-2
electrons in the valence shell
Water, H2O, is a polar molecule. Oxygen is electronegative and hydrogen is electropositive. This
means that __________. - CORRECT ANSWER - the oxygen pulls electrons away from
hydrogen and becomes more negative
The process that occurs when chemical bonds are formed, broken, or rearranged, or electrons are
transferred between reactants is called... - CORRECT ANSWER - A chemical reaction
Energy - CORRECT ANSWER - the capacity to do work
